Method of manufacturing perforated sheets of wood-pulp.



No. 728,804. PATEN'TED MAY 19, 1903.

G. s. LINDBERG. 7 METHOD OF MANUFACTURING PBRFORATED SHEETS 0P WOOD-PULP.

APPLICATION FILED DEG. l i, 1901. N0 MODEL. 2 SHEETS-SHEET 1.

No.728,804.' PATENTED MAY 19, 1903. G. s. LINDBERG.

METHOD OF MANUFACTURING PERFORATED SHEETS OF WOOD PULP. APPLICATION FILED 11110. 14, 1901.

no MODEL. I 2 sums-4mm 2.

UN TED STATES Patented May 19, 1903.

PATENT OFFICE.

METHOD OF MANUFACTURING PERFORATED SHEETS 0F WOOD-PULP.

SPECIFICATION forming part of Letters Patent N 0. 728,804, dated May 19, 1993.

Original application filed April 26,1901, Serial No. 67,526. Divided and this application filed December 14, 1901. Serial No. 85,894. (Nespecimensd To all whom it may concern.-

. Be it known that I, GUSTAF SAMUEL LIND- BERG, a subject of the King of Sweden and Norway, residing at Gothenburg, Sweden,

have invented certain new and useful Improvements in Methods of Manufacturing Perforated Sheets of Wood-Pulp; and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present application is a division of my copending application, Serial No. 57,526, filed Apt-i126, 1901.

The present invention relates to a method of producing perforated sheets of wood-pulp directly in a paper-making machine.

The object of the perforations may be partly to satisfy provisions in the custom-house regulations of some countries that only perforated wood -pulp will be admitted free of duty or draw but slight duty and partly to form a trade-mark, designate a firm-name, or the like.

In carrying out the invention the woodpulp is deposited on the take-up roller and is subjected to the piercing action of air or water jets, determined by apertures in the said roller and acting 011 the pulp when passing in its damp state from the felt to the take-up roller. This continues until the pulp collected on the take-up roller has obtained sufiicient thickness, it being then cut open in usual manner and removed from the roller. The refuse or waste produced in the piercing or perforating operation is carried along by the felt and taken from the latter by a special roll, from which it is removed by means of a scraper, brush, or the like. The take 'np roller is perforated to conform to the desired perforations of the pulp-sheet, and within the roller near its periphery are located tubes which are perforated at the side adjoining the shell of the roller with alongitudinal row of holes corresponding with those in the takeup roller. Into the pipes is forced air or water, which when a row of holes in the takeup roller is brought opposite the holes in the pipe blows away the thin and moist pulp layer covering the former holes.

The invention consists in the particular method hereinafter fully described and claimed.

In the drawings, Figure 1 is an end View of an apparatus adapted for carrying out my method, said apparatus being shown partly in section; and Fig. 2 is a side view of said apparatus, partly in section.

In carrying out my method the felt 1 receives the pulp from the making-cylinder 3, located in the reservoir 2, and delivers it in the usual manner to the take-up roller 4 at the point where the latter and the felt-guiding roller 16 are in contact with each other. The roller 4 is provided with apertures 5 to conform to the desired perforations, as seen from Figs. 1 and2, in the latter figure partly in section. Through one gudgeon of the roller (See Fig. 1.) The two other pipes, 10, lead to and sustain another tube 11, located Within the roller 4, said tube resembling the tube 8, but being situated at some little distance from the latter in the direction of rotation of the roller. This tube 11 is also provided with perforations 9, similar to those in tube 8. The tube 6 communicatesthrough a pipe 12 with some main pipe common to several machines, said main pipe issuing from the pump, blowing-engine, or the like by means of which the liquid or air pressure is produced. The pipe 12 has at 18 a joint, where the lower end of the vertical portion 6 of pipe 6 is inserted, so as to allow the pipe to lengthen or shorten, and accordingly the roller 4 to rise or descend freely. 16 is located a roller 13, past which the felt moves shortly after being in contact with roller 4. The roller 13 is journaled on'sliding bars 14, arranged so as to allow of the roller being pressed by means of them against the In contactwith the felt at the roller 5 felt and caused to take up pulp from the latter. On the roller 13 bears a scraper 15 or the like. According as the perforations of the roller; in the rotation of the latter arrive opposite the holes of the tube 8 the wood-pulp deposited over the perforations of the takeup roller is blown back to the felt or the pulp is prevented from depositing over the perforations of the take-up roller, depending on whether the pulp has begun to be lifted by the take-up roller from the felt or not, which again depends on the position of the tube 8, which may be slightly to the right of the line passing through the centers of the two rollers 4 16, but preferably should just coincide with said line, as shown in Fig. 2. As the blowingis repeated after the pulp is deposited on the roller 4, the sheet of pulp when completed will be provided with holes having quite a clearly-defined edge or outline. As aconsequence smaller perforations arranged to form a trade-mark or the like may likewise be produced in the manner described, the takeup roller being in this case provided with perforations to correspond. The tube 1.1 serves to blow away any pulp which may have chanced to remain in the apertures of the roller 4, so as to keep the latter apertures perfectly clean. The pulp caused by the perforating device to remain on the felt is taken up by the roller 13 bearing yieldingly on the latter. in place of which may be substituted a brush or the like, removes the pulp from the roller 13, which pulp drops into the box 19, which is emptied into the reservoir 2 when required.

Should it be desired at times to make unperforated sheets of pulp, the apertures of the roller 4 are closed up by plugs especially provided for the purpose and arranged to be readily removed orinserted, as required. In manufacturing unperforated sheets the air or liquid conduit 12 is shut off and the roller 13 and box 19 are removed. I

I would state that at the beginning of the operation the end of the pulp-sheet will be The scraping iron or knife 15,-

taken up by the roller 4 in the manner well known in paper-making machines.

By perforating the wood-pulp directly in the machine in the manner described the outlay for a special machine for the purpose is avoided and the labor and waste of pulp are saved which have hitherto been caused by the practice of carrying out the perforating process in a special operation independent of the paper-machine.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is--- r 1. The herein-described method of manufacturing perforated wood-pulp sheets directlyin a paper-making machine which consists in blowing or forcing a fluid in the desired places through the moist layer of pulp at the moment when the latter is being taken up on the take-up roller.

2. The herein-described method of manufacturing perforated wood pulp sheets directly in a paper-making machine which consists in blowing or forcing a fluid in the desired places through the moist layer of pulp at the moment when the latter is being taken up on the take-up roller, said fluid being directed from the side of the pulp adjacent to the surface of the take-up roller.

3. The herein-described method of manufacturing perforated wood-pulp directly in a papermaking machine which consists in blowing orforcing a fluid through perforations in the take-up roller and through the moist layer of pulp at the moment when it is being taken up on said roller and blowing or forcing a fluid through said perforations in the take-up roller to clear them of Wood-pulp, as specified.

In testimony whereof I affix my signature in presence of two witnesses.

GUSTAF SAMUEL LINDBERG.

'Witnesses:

ERNST SVANGVIST, A. F. LUNDBORG. 

